Photographing lens assembly, image capturing unit and electronic device

ABSTRACT

A photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element has positive refractive power, wherein both surfaces thereof are aspheric. The fourth lens element has refractive power, wherein both surfaces thereof are aspheric. The fifth lens element has negative refractive power, wherein both surfaces thereof are aspheric. The sixth lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, wherein both of the two surfaces are aspheric.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No.

14/812,570, filed Jul. 29, 2015, which claims priority to TaiwanApplication 104112136, filed Apr. 15, 2015, which is incorporated byreference herein in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to a photographing lens assembly, animage capturing unit and an electronic device, more particularly to aphotographing lens assembly and an image capturing unit applicable to anelectronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. The sensor of a conventional optical system is typically aCCD (Charge-Coupled Device) or a CMOS (ComplementaryMetal-Oxide-Semiconductor) sensor. As the advanced semiconductormanufacturing technologies have allowed the pixel size of sensors to bereduced and compact optical systems have gradually evolved toward thefield of higher megapixels, there is an increasing demand for compactoptical systems featuring better image quality.

A conventional optical system employed in a portable electronic productmainly adopts a five-element lens structure. Due to the popularity ofmobile terminals with high-end specifications, such as smart phones,wearable devices and tablet personal computers, the requirements forhigh resolution and image quality of present compact optical systemsincrease significantly. However, the conventional optical systems cannotsatisfy these requirements of the compact optical systems.

Other conventional compact optical systems with six-element lensstructure are developed. However, a total track length of theconventional optical system is overly large. Furthermore, theconventional optical system also has the shortcomings of excessivechromatic aberration, unevenly distributed refractive power, severeaberration at the peripheral region of the image and insufficientrelative illumination.

SUMMARY

According to one aspect of the present disclosure, a photographing lensassembly includes, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, and a sixth lens element. Thefirst lens element with positive refractive power has an object-sidesurface being convex in a paraxial region thereof. The second lenselement has negative refractive power. The third lens element haspositive refractive power, wherein both of an object-side surface and animage-side surface of the third lens element are aspheric. The fourthlens element has refractive power, wherein both of an object-sidesurface and an image-side surface of the fourth lens element areaspheric. The fifth lens element has negative refractive power, whereinboth of an object-side surface and an image-side surface of the fifthlens element are aspheric. The sixth lens element with positiverefractive power has an object-side surface being concave in a paraxialregion thereof and an image-side surface being convex in a paraxialregion thereof, wherein both of the object-side surface and theimage-side surface of the sixth lens element are aspheric. Thephotographing lens assembly has a total of six lens elements withrefractive power. There is an air gap in a paraxial region between everytwo of the first lens element, the second lens element, the third lenselement, the fourth lens element, the fifth lens element and the sixthlens element that are adjacent to each other. The photographing lensassembly further includes a stop. When an axial distance between thesecond lens element and the third lens element is T23, an axial distancebetween the third lens element and the fourth lens element is T34, anaxial distance between the stop and the image-side surface of the sixthlens element is SD, an axial distance between the object-side surface ofthe first lens element and the image-side surface of the sixth lenselement is TD, the following conditions are satisfied:0<T23/T34<1.5; and0.75<SD/TD<1.2.

According to another aspect of the present disclosure, an imagecapturing unit includes the aforementioned photographing lens assemblyand an image sensor, wherein the image sensor is disposed on the imageside of the photographing lens assembly.

According to still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

According to yet another aspect of the present disclosure, aphotographing lens assembly includes, in order from an object side to animage side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, and a sixth lenselement. The first lens element has positive refractive power. Thesecond lens element with negative refractive power has an object-sidesurface being convex in a paraxial region thereof and an image-sidesurface being concave in a paraxial region thereof. The third lenselement has positive refractive power, wherein both of an object-sidesurface and an image-side surface of the third lens element areaspheric. The fourth lens element has refractive power, wherein both ofan object-side surface and an image-side surface of the fourth lenselement are aspheric. The fifth lens element has refractive power,wherein both of an object-side surface and an image-side surface of thefifth lens element are aspheric. The sixth lens element with positiverefractive power has an object-side surface being concave in a paraxialregion thereof and an image-side surface being convex in a paraxialregion thereof, wherein both of the object-side surface and theimage-side surface of the sixth lens element are aspheric. Thephotographing lens assembly has a total of six lens elements withrefractive power. There is an air gap in a paraxial region between everytwo of the first lens element, the second lens element, the third lenselement, the fourth lens element, the fifth lens element and the sixthlens element that are adjacent to each other. The photographing lensassembly further includes a stop. When an axial distance between thesecond lens element and the third lens element is T23, an axial distancebetween the third lens element and the fourth lens element is T34, anaxial distance between the stop and the image-side surface of the sixthlens element is SD, an axial distance between an object-side surface ofthe first lens element and the image-side surface of the sixth lenselement is TD, the following m conditions are satisfied:0<T23/T34<2.5; and0.75<SD/TD<1.2.

According to yet another aspect of the present disclosure, aphotographing lens assembly includes, in order from an object side to animage side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, and a sixth lenselement. The first lens element has positive refractive power. Thesecond lens element with negative refractive power has an object-sidesurface being convex in a paraxial region thereof and an image-sidesurface being concave in a paraxial region thereof. The third lenselement with refractive power has an object-side surface being convex ina paraxial region thereof, wherein both of the object-side surface andan image-side surface of the third lens element are aspheric. The fourthlens element has refractive power, wherein both of an object-sidesurface and an image-side surface of the fourth lens element areaspheric. The fifth lens element has refractive power, wherein both ofan object-side surface and an image-side surface of the fifth lenselement are aspheric. The sixth lens element with positive refractivepower has an object-side surface being concave in a paraxial regionthereof and an image-side surface being convex in a paraxial regionthereof, wherein both of the object-side surface and the image-sidesurface of the sixth lens element are aspheric. The photographing lensassembly has a total of six lens elements with refractive power. Thereis an air gap in a paraxial region between every two of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element and the sixth lens element that areadjacent to each other. The photographing lens assembly further includesa stop. When an axial distance between the second lens element and thethird lens element is T23, an axial distance between the third lenselement and the fourth lens element is T34, an axial distance betweenthe stop and the image-side surface of the sixth lens element is SD, anaxial distance between an object-side surface of the first lens elementand the image-side surface of the sixth lens element is TD, thefollowing conditions are satisfied:0<T23/T34<5.0; and0.75<SD/TD<1.2.

According to yet another aspect of the present disclosure, aphotographing lens assembly includes, in order from an object side to animage side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, and a sixth lenselement. The first lens element has positive refractive power. Thesecond lens element has negative refractive power. The third lenselement has refractive power, wherein both of an object-side surface andan image-side surface of the third lens element are aspheric. The fourthlens element has refractive power, wherein both of an object-sidesurface and an image-side surface of the fourth lens element areaspheric. The fifth lens element with refractive power has an image-sidesurface being concave in a paraxial region thereof, wherein both of anobject-side surface and the image-side surface of the fifth lens elementare aspheric. The sixth lens element with positive refractive power hasan object-side surface being concave in a paraxial region thereof and animage-side surface being convex in a paraxial region thereof, whereinboth of the object-side surface and the image-side surface of the sixthlens element are aspheric. The photographing lens assembly has a totalof six lens elements with refractive power. There is an air gap in aparaxial region between every two of the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element and the sixth lens element that are adjacent to each other.The photographing lens assembly further includes a stop. When an axialdistance between the second lens element and the third lens element isT23, an axial distance between the third lens element and the fourthlens element is T34, an axial distance between the stop and theimage-side surface of the sixth lens element is SD, an axial distancebetween an object-side surface of the first lens element and theimage-side surface of the sixth lens element is TD, the followingconditions are satisfied:0<T23/T34<2.5; and0.75<SD/TD<1.2.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 shows an electronic device according to one embodiment;

FIG. 20 shows an electronic device according to another embodiment; and

FIG. 21 shows an electronic device according to still anotherembodiment.

DETAILED DESCRIPTION

A photographing lens assembly includes, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement. The photographing lens assembly has a total of six lenselements with refractive power.

According to the photographing lens assembly of the present disclosure,there is an air gap in a paraxial region arranged between every two ofthe first lens element, the second lens element, the third lens element,the fourth lens element, the fifth lens element and the sixth lenselement that are adjacent to each other, that is, each of the firstthrough sixth lens elements of the photographing lens assembly is asingle and non-cemented lens element. Moreover, the manufacturingprocess of the cemented lenses is more complex than the non-cementedlenses. In particular, an image-side surface of one lens element and anobject-side surface of the following lens element need to have accuratecurvature to ensure these two lens elements will be highly cemented.However, during the cementing process, those two lens elements might notbe highly cemented due to displacement and it is thereby not favorablefor the image quality. Therefore, there is an air gap in a paraxialregion between every two of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement and the sixth lens element that are adjacent to each other inthe present disclosure for solving the problem generated by the cementedlens elements.

The first lens element with positive refractive power can have anobject-side surface being convex in a paraxial region thereof.Therefore, it is favorable for keeping the photographing lens assemblycompact.

The second lens element with negative refractive power can have anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof.Therefore, it is favorable for correcting the chromatic aberration.

The third lens element can have positive refractive power. The thirdlens element can have an object-side surface being convex in a paraxialregion thereof. Therefore, it is favorable for balancing the arrangementof the refractive power so as to reduce the sensitivity of thephotographing lens assembly.

The fourth lens element can have negative refractive power. The fourthlens element can have an object-side surface being concave in a paraxialregion thereof and an image-side surface being convex in a paraxialregion thereof. Therefore, it is favorable for effectively correctingthe Petzval's sum so as to improve the flatness of an image surface andeffectively correct the astigmatism.

The fifth lens element can have negative refractive power. The fifthlens element can have an object-side surface being convex in a paraxialregion thereof and an image-side surface being concave in a paraxialregion thereof. At least one of the object-side surface and theimage-side surface of the fifth lens element can have at least oneinflection point. Therefore, it is favorable for the principal pointbeing positioned away from the image side of the photographing lensassembly so as to reduce the back focal length, thereby keeping acompact size thereof. Furthermore, it is favorable for effectivelyreducing the incident angle of the light projecting onto the imagesensor so as to improve the image-sensing efficiency of the imagesensor, thereby effectively correcting the aberration of the off-axisfield.

The sixth lens element with positive refractive power has an object-sidesurface being concave in a paraxial region thereof and an image-sidesurface being convex in a paraxial region thereof. At least one of theobject-side surface and the image-side surface of the sixth lens elementcan have at least one inflection point. Therefore, it is favorable forbalancing the refractive power distribution of the photographing lensassembly and correcting the aberration at the peripheral region of theimage, thereby improving the image quality.

When an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the third lens elementand the fourth lens element is T34, the following condition issatisfied: 0<T23/T34<5.0. Therefore, the axial distances between thethird lens element and the adjacent lens elements are properlydistributed so that it is favorable for improving the image quality andproviding the photographing lens assembly with sufficient amount ofspace; thereby, it is favorable for assembling the photographing lensassembly so as to increase the manufacturing yield rate. Preferably, thefollowing condition is satisfied: 0<T23/T34<2.5. Preferably, thefollowing condition can also be satisfied: 0<T23/T34<1.5. Preferably,the following condition can be further satisfied: 0.1<T23/T34<1.0.

According to the present disclosure, the photographing lens assemblyfurther includes a stop. When an axial distance between the stop and theimage-side surface of the sixth lens element is SD, an axial distancebetween the object-side surface of the first lens element and theimage-side surface of the sixth lens element is TD, the followingcondition is satisfied: 0.75<SD/TD<1.2. Therefore, it is favorable forreducing a total track length of the photographing lens assembly andproviding sufficient relative illumination so as to keep thephotographing lens assembly compact and improve the image quality.

When a focal length of the photographing lens assembly is f, a curvatureradius of the image-side surface of the fifth lens element is R10, acurvature radius of the object-side surface of the sixth lens element isR11, the following condition can be satisfied: 0.25<|R10-R11|/f.Therefore, it is favorable for increasing the difference of thecurvatures between the fifth lens element and the sixth lens element soas to improve the capability of aberration correction.

When a curvature radius of the object-side surface of the fourth lenselement is R7, a curvature radius of the image-side surface of thefourth lens element is R8, the following condition can be satisfied:−0.5<(R7-R8)/(R7+R8)<0.5. Therefore, the curvature of the fourth lenselement is properly distributed so that it is favorable for solvingnumerous molding problems.

When the curvature radius of the object-side surface of the sixth lenselement is R11, a curvature radius of the image-side surface of thesixth lens element is R12, the following condition can be satisfied:−1.0<R12/|R11|<0. Therefore, it is favorable for correcting theaberration of the photographing lens assembly.

When a maximum refractive index among the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element and the sixth lens element is Nmax, the following conditioncan be satisfied: 1.50<Nmax<1.70. Therefore, the refractive indices ofthe lens elements are properly distributed so that it is favorable forchoosing proper material for each lens element.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, the following condition can besatisfied: TL<8.0 millimeters (mm). Therefore, it is favorable forkeeping the photographing lens assembly compact so as to be equipped inan electronic device.

When a focal length of the first lens element is f1, a focal length ofthe i-th lens element is fi (for example, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, and a focal length of the sixth lens elementis f6), the following condition can be satisfied: |f1|<|fi|, whereini=2, 3, 4, 5, 6. Therefore, it is favorable for concentrating thepositive refractive power at the object side of the photographing lensassembly so as to keep the photographing lens assembly compact.

According to the present disclosure, at least one of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element and the sixth lens element can haveat least one inflection point. That is, each of the object-side surfacesand the image-side surfaces of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement and the sixth lens element can have at least one inflectionpoint. Therefore, it is favorable for correcting the aberration of theoff-axis field so as to improve the image quality.

According to the present disclosure, there is no lens element withrefractive power between the stop and the first lens element. That is,the stop can be disposed between an imaged object and the first lenselement, or can be disposed between the first lens element and thesecond lens element. Therefore, it is favorable for obtaining a balancebetween the telecentric and wide-angle characteristics.

When a central thickness of the third lens element is CT3, the axialdistance between the third lens element and the fourth lens element isT34, the following condition can be satisfied: 0.5<CT3/T34<1.9.Therefore, it is favorable for effectively balancing the refractivepower distribution of the photographing lens assembly.

When the focal length of the photographing lens assembly is f, the focallength of the fifth lens element is f5, the following condition can besatisfied: −1.0<f/f5<0. Therefore, it is favorable for reducing the backfocal length so as to stay in a compact size thereof and reduce thesensitivity of the photographing lens assembly.

When the curvature radius of the object-side surface of the sixth lenselement is R11, the curvature radius of the image-side surface of thesixth lens element is R12, the following condition can be satisfied:0<(R1 −R12)/(R11+R12) <1.0. Therefore, it is favorable for correctingthe astigmatism so as to further improve the image quality.

When a curvature radius of the object-side surface of the third lenselement is R5, a curvature radius of an image-side surface of the thirdlens element is R6, the following condition can be satisfied:−3.5<(R5+R6)/(R5−R6)<1.2. Therefore, it is favorable for correcting thespherical aberration.

When the axial distance between the third lens element and the fourthlens element is T34, an axial distance between the fourth lens elementand the fifth lens element is T45, the following condition can besatisfied: 0<T45/T34<1.5. Therefore, it is favorable for reducing thetotal track length so as to keep the photographing lens assemblycompact.

When the focal length of the photographing lens assembly is f, the focallength of the fourth lens element is f4, the following condition can besatisfied: −1.0<f/f4<0.5. Therefore, it is favorable for reducing theback focal length so as to stay in a compact size thereof and reduce thesensitivity of the photographing lens assembly.

When an axial distance between the image-side surface of the sixth lenselement and the image surface is BL, the axial distance between theobject-side surface of the first lens element and the image-side surfaceof the sixth lens element is TD, the following condition can besatisfied: 0.1<BL/TD<0.25. Therefore, it is favorable for furtherreducing the back focal length so as to keep the photographing lensassembly compact. Furthermore, it is also favorable for disposingadditional optical components.

According to the photographing lens assembly of the present disclosure,an aperture stop can be configured as a front stop or a middle stop. Afront stop disposed between an imaged object and the first lens elementcan provide a longer distance between an exit pupil and the imagesurface to produce a telecentric effect, and thereby improves theimage-sensing efficiency of an image sensor (for example, CCD or CMOS).A middle stop disposed between the first lens element and the imagesurface is favorable for enlarging the field of view and therebyprovides a wider field of view for the same.

According to the photographing lens assembly of the present disclosure,the lens elements thereof can be made of glass or plastic material. Whenthe lens elements are made of glass material, the distribution of therefractive power of the photographing lens assembly may be more flexibleto design. When the lens elements are made of plastic material, themanufacturing cost can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, since the asphericsurface of the lens element is easy to form a shape other than sphericalsurface so as to have more controllable variables for eliminating theaberration thereof, and to further decrease the required number of thelens elements. Therefore, the total track length of the photographinglens assembly can also be reduced.

According to the photographing lens assembly of the present disclosure,each of an object-side surface and an image-side surface has a paraxialregion and an off-axis region. The paraxial region refers to the regionof the surface where light rays travel close to the optical axis, andthe off-axis region refers to the region of the surface away from theparaxial region. Particularly, when the lens element has a convexsurface, it indicates that the surface is convex in the paraxial regionthereof; when the lens element has a concave surface, it indicates thatthe surface is concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement is in the paraxial region thereof.

According to the photographing lens assembly of the present disclosure,an image surface of the photographing lens assembly, based on thecorresponding image sensor, can be flat or curved, especially a curvedsurface being concave facing towards the object side of thephotographing lens assembly.

According to the photographing lens assembly of the present disclosure,the photographing lens assembly can include at least one stop, such asan aperture stop, a glare stop or a field stop. Said glare stop or saidfield stop is set for eliminating the stray light and thereby improvingthe image quality thereof.

According to the present disclosure, an image capturing unit isprovided. The image capturing unit includes the photographing lensassembly according to the aforementioned photographing lens assembly ofthe present disclosure, and an image sensor, wherein the image sensor isdisposed on the image side of the aforementioned photographing lensassembly, that is, the image sensor can be disposed on or near an imagesurface of the aforementioned photographing lens assembly. In someembodiments, the image capturing unit can further include a barrelmember, a holding member or a combination thereof.

In FIG. 19, FIG. 20 and FIG. 21, an image capturing device 10 may beinstalled in, but not limited to, an electronic device, including asmart phone (FIG. 19), a tablet personal computer (FIG. 20) or awearable device (FIG. 21). The electronic devices shown in the figuresare only exemplary for showing the image capturing device of presentdisclosure installed in an electronic device and are not limitedthereto. In some embodiments, the electronic device can further include,but not limited to, a display unit, a control unit, a storage unit, arandom access memory unit (RAM), a read only memory unit (ROM) or acombination thereof.

According to the photographing lens assembly of the present disclosure,the photographing lens assembly can be optionally applied to movingfocus optical systems. Furthermore, the photographing lens assembly isfeatured with good capability in the corrections resulting high imagequality, and can be applied to 3D (three-dimensional) image capturingapplications, in products such as digital cameras, mobile devices,digital tablets, wearable devices, smart televisions, networksurveillance devices, motion sensing input devices, dashboard cameras,vehicle backup cameras and other electronic imaging devices. Accordingto the above description of the present disclosure, the followingspecific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 190. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 100, a first lens element 110, a second lens element 120,a third lens element 130, a fourth lens element 140, a fifth lenselement 150, a sixth lens element 160, an IR-cut filter 170 and an imagesurface 180, wherein the photographing lens assembly has a total of sixlens elements (110-160) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 110, thesecond lens element 120, the third lens element 130, the fourth lenselement 140, the fifth lens element 150 and the sixth lens element 160that are adjacent to each other.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with negative refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being concave in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being convex in a paraxial region thereof and animage-side surface 152 being concave in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. The object-side surface 151 of the fifth lens element 150 hasat least one inflection point. The image-side surface 152 of the fifthlens element 150 has at least one inflection point.

The sixth lens element 160 with positive refractive power has anobject-side surface 161 being concave in a paraxial region thereof andan image-side surface 162 being convex in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. The image-side surface 162 of the sixth lens element 160 hasat least one inflection point.

The IR-cut filter 170 is made of glass and located between the sixthlens element 160 and the image surface 180, and will not affect thefocal length of the photographing lens assembly. The image sensor 190 isdisposed on or near the image surface 180 of the photographing lensassembly. The equation of the aspheric surface profiles of theaforementioned lens elements of the 1st embodiment is expressed asfollows:X(Y)=(Y ² /R)/(1+sqrt(1−(1+k)×(Y|R)²))+Σ(Ai)×(Y′)

, where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the photographing lens assembly of the image capturing unit accordingto the 1st embodiment, when a focal length of the photographing lensassembly is f, an f-number of the photographing lens assembly is Fno,and half of a maximal field of view of the photographing lens assemblyis HFOV, these parameters have the following values: f=3.33 millimeters(mm); Fno=2.90; and HFOV=31.0 degrees (deg.).

When a maximum refractive index among the first lens element 110, thesecond lens element 120, the third lens element 130, the fourth lenselement 140, the fifth lens element 150 and the sixth lens element 160is Nmax, the following condition is satisfied: Nmax=1.650.

When a central thickness of the third lens element 130 is CT3, an axialdistance between the third lens element 130 and the fourth lens element140 is T34, the following condition is satisfied: CT3/T34=1.26.

When an axial distance between the second lens element 120 and the thirdlens element 130 is T23, the axial distance between the third lenselement 130 and the fourth lens element 140 is T34, the followingcondition is satisfied: T23/T34=0.84.

When the axial distance between the third lens element 130 and thefourth lens element 140 is T34, an axial distance between the fourthlens element 140 and the fifth lens element 150 is T45, the followingcondition is satisfied: T45/T34=0.25.

When a curvature radius of the object-side surface 131 of the third lenselement 130 is R5, a curvature radius of the image-side surface 132 ofthe third lens element 130 is R6, the following condition is satisfied:(R5+R6)/(R5−R6)=−1.63.

When a curvature radius of the object-side surface 141 of the fourthlens element 140 is R7, a curvature radius of the image-side surface 142of the fourth lens element 140 is R8, the following condition issatisfied: (R7−R8)/(R7+R8)=−0.06.

When a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, a curvature radius of the image-side surface 162 ofthe sixth lens element 160 is R12, the following condition is satisfied:(R11−R12)/(R11+R12)=0.10.

When the curvature radius of the object-side surface 161 of the sixthlens element 160 is R11, the curvature radius of the image-side surface162 of the sixth lens element 160 is R12, the following condition issatisfied: R12/|R11|=−0.82.

When the focal length of the photographing lens assembly is f, acurvature radius of the image-side surface 152 of the fifth lens element150 is R10, the curvature radius of the object-side surface 161 of thesixth lens element 160 is R11, the following condition is satisfied:|R10-R11|/f=1.55.

When the focal length of the photographing lens assembly is f, a focallength of the fourth lens element 140 is f4, the following condition issatisfied: f/f4=0.11.

When the focal length of the photographing lens assembly is f, a focallength of the fifth lens element 150 is f5, the following condition issatisfied: f/f5=−0.62.

When an axial distance between the stop 100 and the image-side surface162 of the sixth lens element 160 is SD, an axial distance between theobject-side surface 111 of the first lens element 110 and the image-sidesurface 162 of the sixth lens element 160 is TD, the following conditionis satisfied: SD/TD=0.99.

When an axial distance between the image-side surface 162 of the sixthlens element 160 and the image surface 180 is BL, the axial distancebetween the object-side surface 111 of the first lens element 110 andthe image-side surface 162 of the sixth lens element 160 is TD, thefollowing condition is satisfied: BL/TD=0.17.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 180 is TL, the followingcondition is satisfied:TL=4.03 mm.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 3.33 mm, Fno = 2.90, HFOV = 31.0 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.037  2 Lens 1 1.298 (ASP) 0.429Plastic 1.544 55.9 2.69 3 10.047 (ASP) 0.186 4 Lens 2 8.553 (ASP) 0.249Plastic 1.650 21.4 −5.05 5 2.343 (ASP) 0.272 6 Lens 3 2.029 (ASP) 0.407Plastic 1.544 55.9 4.80 7 8.454 (ASP) 0.324 8 Lens 4 −0.599 (ASP) 0.274Plastic 1.544 55.9 29.98 9 −0.671 (ASP) 0.081 10 Lens 5 2.714 (ASP)0.594 Plastic 1.650 21.4 −5.36 11 1.394 (ASP) 0.150 12 Lens 6 −3.760(ASP) 0.482 Plastic 1.544 55.9 25.71 13 −3.097 (ASP) 0.200 14 IR-cutfilter Plano 0.248 Glass 1.517 64.2 — 15 Plano 0.129 16 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −2.3417E−01−1.0000E+00 4.0607E+01 −2.0585E+01  −1.0000E+00 −5.0000E+01 A4 =−2.6809E−02 −1.4039E−01 −1.8580E−01  −1.5143E−02  −2.3790E−01−2.8124E−02 A6 = −8.9153E−02 −1.1661E−01 3.4828E−01 3.2803E−01−1.8700E−02 −2.8135E−01 A8 = −1.1465E−01 −2.0770E−01 −3.1403E−01 −1.1208E−01  −1.0978E−01  4.7751E−02 A10 = −1.4576E−01 −7.7714E−021.0540E−01 1.9620E−01  4.1248E−02  2.7421E−02 A12 =  1.0344E−01 3.6052E−01 6.1723E−01 1.1324E−01  3.4111E−02 −1.0440E−01 A14 =−1.1003E+00 −8.0358E−01 −5.4790E−01  5.7873E−02 −1.3379E−01  6.8073E−02Surface # 8 9 10 11 12 13 k = −3.0777E+00 −3.0984E+00  1.8411E+00−2.2529E+01 −5.7341E+00  −9.0000E+01 A4 =  1.9865E−01  1.3513E−01−4.4433E−01 −2.2390E−01 8.6937E−03  3.5074E−02 A6 = −4.9785E−01−2.0956E−01  2.1178E−01  9.3984E−02 1.6553E−02 −7.7590E−03 A8 = 4.2663E−01  1.8194E−01 −7.8289E−02 −1.1078E−02 −1.4806E−02  −2.6024E−03A10 = −3.1365E−01 −4.9021E−02 −3.5234E−02 −2.7090E−02 1.4966E−03 3.9171E−04 A12 =  2.4799E−01 −1.1928E−02 −4.1747E−02  1.5440E−021.1518E−03 −1.8004E−04 A14 = −8.2421E−02  1.3784E−02  4.2197E−02−2.3749E−03 −2.2148E−04   4.0802E−05

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-16 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A14 represent the asphericcoefficients ranging from the 4th order to the 14th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of m the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 290. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 200, a first lens element 210, a second lens element 220,a third lens element 230, a fourth lens element 240, a fifth lenselement 250, a sixth lens element 260, an IR-cut filter 270 and an imagesurface 280, wherein the photographing lens assembly has a total of sixlens elements (210-260) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 210, thesecond lens element 220, the third lens element 230, the fourth lenselement 240, the fifth lens element 250 and the sixth lens element 260that are adjacent to each other.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with positive refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being concave in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric.

The fifth lens element 250 with negative refractive power has anobject-side surface 251 being concave in a paraxial region thereof andan image-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. The image-side surface 252 of the fifth lens element 250 hasat least one inflection point.

The sixth lens element 260 with positive refractive power has anobject-side surface 261 being concave in a paraxial region thereof andan image-side surface 262 being convex in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. The object-side surface 261 of the sixth lens element 260 hasat least one inflection point.

The IR-cut filter 270 is made of glass and located between the sixthlens element 260 and the image surface 280, and will not affect thefocal length of the photographing lens assembly. The image sensor 290 isdisposed on or near the image surface 280 of the photographing lensassembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 4.82 mm, Fno = 2.60, HFOV = 22.1 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.300  2 Lens 1 1.457 (ASP) 0.615Plastic 1.544 55.9 3.23 3 7.214 (ASP) 0.055 4 Lens 2 7.114 (ASP) 0.230Plastic 1.640 23.3 −6.25 5 2.528 (ASP) 0.257 6 Lens 3 1.933 (ASP) 0.741Plastic 1.544 55.9 6.27 7 3.852 (ASP) 0.423 8 Lens 4 −1.545 (ASP) 0.266Plastic 1.640 23.3 −9.59 9 −2.204 (ASP) 0.307 10 Lens 5 −2.857 (ASP)0.488 Plastic 1.544 55.9 −6.20 11 −19.801 (ASP) 0.050 12 Lens 6 −43.290(ASP) 0.985 Plastic 1.640 23.3 47.32 13 −17.974 (ASP) 0.200 14 IR-cutfilter Plano 0.248 Glass 1.517 64.2 — 15 Plano 0.167 16 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 7 k =  1.2718E−01−1.0000E+00 3.9195E+01 −1.4625E+01 −1.0000E+00  1.5009E+00 A4 =−1.2860E−02 −8.9762E−02 −1.7783E−01  −6.8729E−02 −1.1279E−01 −5.9968E−02A6 = −2.4541E−02  1.3323E−01 3.5819E−01  2.4564E−01  6.1066E−02−1.3833E−01 A8 =  3.4839E−02 −6.7839E−02 −2.8381E−01  −1.6044E−01−9.7025E−03  3.6815E−02 A10 = −8.6955E−02 −1.7173E−01 5.9882E−03 9.0750E−02  6.2132E−02 −2.3661E−02 A12 =  7.3040E−02  1.8997E−011.5542E−01  4.6076E−02 −2.6760E−02 −6.6385E−02 A14 = −4.0788E−02−6.3126E−02 −7.4230E−02  −3.3975E−03  3.6183E−02  7.2648E−02 Surface # 89 10 11 12 13 k = −1.0000E+00  1.6409E+00 −1.7541E+01 −1.0000E+00−5.0000E+01  −9.0000E+01  A4 = 4.7078E−02 1.7804E−01 −3.0692E−01−1.9620E−01 1.1646E−02 8.2326E−03 A6 = −4.6360E−01  −2.7335E−01 −2.3638E−02  5.7040E−02 8.2207E−03 8.9025E−04 A8 = 2.8867E−01 1.6811E−01−8.7088E−03  2.0452E−04 −6.0496E−03  −3.0102E−03  A10 = −4.6729E−01 −9.7365E−03  −3.2491E−02 −2.2124E−02 9.6119E−04 8.6102E−04 A12 =2.4733E−01 4.8078E−03 −5.5958E−02  1.7412E−02 1.3237E−04 −1.4336E−04 A14 = 1.1586E−02 1.2087E−03  9.4652E−02 −3.8062E−03 −5.8389E−05 8.1231E−06

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 4.82 (R11 − R12)/(R11 + R12) 0.41 Fno 2.60R12/|R11| −0.42 HFOV [deg.] 22.1 |R10 − R11|/f 4.87 Nmax 1.640 f/f4−0.50 CT3/T34 1.75 f/f5 −0.78 T23/T34 0.61 SD/TD 0.93 T45/T34 0.73 BL/TD0.14 (R5 + R6)/(R5 − R6) −3.01 TL [mm] 5.03 (R7 − R8)/(R7 + R8) −0.18

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 390. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 300, a first lens element 310, a second lens element 320,a third lens element 330, a fourth lens element 340, a fifth lenselement 350, a sixth lens element 360, an IR-cut filter 370 and an imagesurface 380, wherein the photographing lens assembly has a total of sixlens elements (310-360) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 310, thesecond lens element 320, the third lens element 330, the fourth lenselement 340, the fifth lens element 350 and the sixth lens element 360that are adjacent to each other.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being convex in a paraxial region thereof and animage-side surface 322 being concave in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with positive refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being concave in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric. The object-side surface 351 of the fifth lens element 350 hasat least one inflection point. The image-side surface 352 of the fifthlens element 350 has at least one inflection point.

The sixth lens element 360 with positive refractive power has anobject-side surface 361 being concave in a paraxial region thereof andan image-side surface 362 being convex in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. The object-side surface 361 of the sixth lens element 360 hasat least one inflection point. The image-side surface 362 of sixth lenselement 360 has at least one inflection point.

The IR-cut filter 370 is made of glass and located between the sixthlens element 360 and the image surface 380, and will not affect thefocal length of the photographing lens assembly. The image sensor 390 isdisposed on or near the image surface 380 of the photographing lensassembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 3.61 mm, Fno = 2.45, HFOV = 29.0 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.184  2 Lens 1 1.376 (ASP) 0.623Plastic 1.544 55.9 2.60 3 44.071 (ASP) 0.071 4 Lens 2 8.523 (ASP) 0.236Plastic 1.640 23.3 −4.09 5 1.981 (ASP) 0.176 6 Lens 3 2.648 (ASP) 0.628Plastic 1.544 55.9 6.44 7 9.952 (ASP) 0.360 8 Lens 4 −2.231 (ASP) 0.317Plastic 1.640 23.3 −55.18 9 −2.513 (ASP) 0.089 10 Lens 5 2.150 (ASP)0.544 Plastic 1.544 55.9 −4.67 11 1.061 (ASP) 0.195 12 Lens 6 −21.896(ASP) 0.420 Plastic 1.544 55.9 9.50 13 1.376 (ASP) 0.200 14 IR-cutfilter Plano 0.210 Glass 1.517 64.2 — 15 Plano 0.133 16 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −1.0225E−01−1.0000E+00 7.7005E+01 −9.6828E+00 −1.0000E+00  −1.0386E+01 A4 =−2.1550E−02 −1.1218E−01 −1.4011E−01  −1.0672E−02 −1.8990E−01 −2.6408E−02 A6 = −4.8157E−02 −2.7792E−02 3.2912E−01  3.4305E−014.3859E−02 −2.0901E−01 A8 = −1.6315E−02 −8.9686E−02 −3.9539E−01 −1.6648E−01 4.7467E−02  1.7728E−01 A10 = −6.3356E−02 −1.2621E−011.7716E−01  1.5910E−02 4.2225E−02  1.0549E−03 A12 = −6.5097E−02 4.8763E−01 4.4906E−01  4.0276E−01 −1.5393E−01  −1.5329E−01 A14 = 9.7823E−03 −3.5607E−01 −3.9213E−01  −1.2749E−02 3.7420E−01  1.5750E−01Surface # 8 9 10 11 12 13 k = −2.2629E+01 1.1927E+00 −2.0000E+01−6.4299E+00 −5.0000E+01 −9.0000E+01 A4 =  1.1135E−01 1.1363E−01−5.2245E−01 −2.1332E−01  3.4732E−02  2.1403E−02 A6 = −6.0998E−01−2.5141E−01   3.2012E−01  1.2211E−01 −3.6358E−03 −1.2403E−03 A8 = 5.8383E−01 1.7687E−01 −1.1746E−01 −3.4410E−02 −1.4908E−02 −5.6478E−04A10 = −3.6264E−01 −6.2520E−02   7.0635E−03 −2.5702E−02  1.9078E−03 7.3108E−05 A12 = −8.5500E−02 −3.4443E−03  −4.0352E−02  1.6141E−02 1.2529E−03 −3.4931E−04 A14 =  1.7467E−01 1.3878E−02  3.1165E−02−2.3361E−03 −2.3086E−04  6.6601E−05

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 3.61 (R11 − R12)/(R11 + R12) 0.68 Fno 2.45R12/|R11| −0.19 HFOV [deg.] 29.0 |R10 − R11|/f 6.36 Nmax 1.640 f/f4−0.07 CT3/T34 1.74 f/f5 −0.77 T23/T34 0.49 SD/TD 0.95 T45/T34 0.25 BL/TD0.15 (R5 + R6)/(R5 − R6) −1.73 TL [mm] 4.20 (R7 − R8)/(R7 + R8) −0.06

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the m image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 490. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 410, an aperture stop 400, a second lens element 420,a third lens element 430, a fourth lens element 440, a fifth lenselement 450, a sixth lens element 460, an IR-cut filter 470 and an imagesurface 480, wherein the photographing lens assembly has a total of sixlens elements (410-460) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 410, thesecond lens element 420, the third lens element 430, the fourth lenselement 440, the fifth lens element 450 and the sixth lens element 460that are adjacent to each other.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being convex in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with negative refractive power has anobject-side surface 421 being convex in a paraxial region thereof and animage-side surface 422 being concave in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with positive refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being convex in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric.

The fifth lens element 450 with negative refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being concave in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric. The object-side surface 451 of the fifth lens element 450 hasat least one inflection point. The image-side surface 452 of the fifthlens element 450 has at least one inflection point.

The sixth lens element 460 with positive refractive power has anobject-side surface 461 being concave in a paraxial region thereof andan image-side surface 462 being convex in a paraxial region thereof. Thesixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. The object-side surface 461 of the sixth lens element 460 hasat least one inflection point. The image-side surface 462 of the sixthlens element 460 has at least one inflection point.

The IR-cut filter 470 is made of glass and located between the sixthlens element 460 and the image surface 480, and will not affect thefocal length of the photographing lens assembly. The image sensor 490 isdisposed on or near the image surface 480 of the photographing lensassembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 3.52 mm, Fno = 2.57, HFOV = 29.2 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Lens 1 6.320 (ASP) 0.369 Plastic 1.544 55.9 4.09 2−3.365 (ASP) 0.030 3 Ape. Stop Plano 0.194 4 Lens 2 3.528 (ASP) 0.530Plastic 1.640 23.3 −4.38 5 1.470 (ASP) 0.113 6 Lens 3 3.432 (ASP) 0.596Plastic 1.544 55.9 2.81 7 −2.588 (ASP) 0.534 8 Lens 4 −2.929 (ASP) 0.400Plastic 1.640 23.3 −90.33 9 −3.249 (ASP) 0.195 10 Lens 5 2.371 (ASP)0.570 Plastic 1.544 55.9 −3.69 11 0.995 (ASP) 0.236 12 Lens 6 −43.290(ASP) 0.300 Plastic 1.544 55.9 11.04 13 −5.286 (ASP) 0.200 14 IR-cutfilter Plano 0.248 Glass 1.517 64.2 — 15 Plano 0.133 16 Image Plano — —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 8 Aspheric Coefficients Surface # 1 2 4 5 6 7 k =  4.9603E−01−1.0000E+00 1.3183E+01 −6.2821E+00 −1.0000E+00  −1.8676E+00 A4 =−6.6620E−02 −9.0589E−02 −2.3468E−01  −1.1473E−01 −1.0515E−01 −4.4129E−02 A6 = −1.6188E−02  1.4886E−01 2.7849E−01  1.4583E−018.5972E−02 −9.8688E−02 A8 =  2.9899E−02 −1.5991E−01 −4.1209E−01 −1.7985E−01 1.3136E−02  9.3940E−02 A10 = −1.0378E−01 −1.2666E−014.9345E−02  1.1253E−01 2.3625E−02 −4.8994E−05 A12 =  1.0062E−01 3.3688E−01 3.4274E−01 −2.8277E−02 −4.6174E−02  −6.8198E−02 A14 =−6.3444E−02 −2.0644E−01 −3.9035E−01  −9.8233E−03 2.1100E−02  5.2555E−02Surface # 8 9 10 11 12 13 k = −6.5326E+00 1.9599E+00  1.8472E+00−4.8893E+00 −5.0000E+01 −9.0000E+01 A4 =  1.0589E−01 8.3105E−02−5.6220E−01 −2.3016E−01 −2.7902E−02  1.3650E−02 A6 = −4.8937E−01−2.0227E−01   2.8540E−01  1.1134E−01  5.0618E−03  2.8433E−03 A8 = 4.6954E−01 1.6358E−01 −8.0097E−02 −3.2747E−02 −1.3654E−02 −1.1332E−03A10 = −3.6505E−01 −6.8366E−02  −7.7121E−03 −2.5509E−02  1.9422E−03−1.2545E−04 A12 =  1.2217E−01 −1.0448E−02  −5.3454E−02  1.6508E−02 1.2098E−03 −3.5246E−04 A14 = −1.8399E−02 2.0657E−02  3.4221E−02−2.4015E−03 −2.2286E−04  7.5869E−05

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 3.52 (R11 − R12)/(R11 + R12) 0.78 Fno 2.57R12/|R11| −0.12 HFOV [deg.] 29.2 |R10 − R11|/f 12.58 Nmax 1.640 f/f4−0.04 CT3/T34 1.12 f/f5 −0.95 T23/T34 0.21 SD/TD 0.90 T45/T34 0.37 BL/TD0.14 (R5 + R6)/(R5 − R6) 0.14 TL [mm] 4.65 (R7 − R8)/(R7 + R8) −0.05

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 590. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 510, a second lens element 520, an aperture stop 500,a third lens element 530, a fourth lens element 540, a fifth lenselement 550, a sixth lens element 560, an IR-cut filter 570 and an imagesurface 580, wherein the photographing lens assembly has a total of sixlens elements (510-560) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 510, thesecond lens element 520, the third lens element 530, the fourth lenselement 540, the fifth lens element 550 and the sixth lens element 560that are adjacent to each other.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being concave in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric.

The second lens element 520 with negative refractive power has anobject-side surface 521 being convex in a paraxial region thereof and animage-side surface 522 being concave in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with positive refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being concave in a paraxial region thereof andan image-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being concave in a paraxial region thereof.The fifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric. The image-side surface 552 of the fifth lens element 550 hasat least one inflection point.

The sixth lens element 560 with positive refractive power has anobject-side surface 561 being concave in a paraxial region thereof andan image-side surface 562 being convex in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. The image-side surface 562 of the sixth lens element 560 hasat least one inflection point.

The IR-cut filter 570 is made of glass and located between the sixthlens element 560 and the image surface 580, and will not affect thefocal length of the photographing lens assembly. The image sensor 590 isdisposed on or near the image surface 580 of the photographing lensassembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 4.69 mm, Fno = 2.65, HFOV = 22.6 deg. Surface# Curvature Radius Thickness Material Index Abbe # Focal Length 0 ObjectPlano Infinity 1 Lens 1 1.521 0.587 Plastic 1.535 55.7 3.74 2 5.473(ASP) 0.032 3 Lens 2 6.195 (ASP) 0.230 Plastic 1.640 23.3 −9.30 4 2.991(ASP) 0.105 5 Ape. Stop Plano 0.039 6 Lens 3 2.039 (ASP) 0.795 Plastic1.544 55.9 4.68 7 8.800 (ASP) 0.367 8 Lens 4 −1.879 (ASP) 0.799 Plastic1.640 23.3 −7.14 9 −3.723 (ASP) 0.445 10 Lens 5 −2.217 (ASP) 0.230Plastic 1.535 55.7 −3.95 11 45.872 (ASP) 0.050 12 Lens 6 −43.290 (ASP)0.691 Plastic 1.640 23.3 10.44 13 −5.825 (ASP) 0.200 14 IR-cut filterPlano 0.240 Glass 1.517 64.2 — 15 Plano 0.132 16 Image Plano — Note:Reference wavelength is 587.6 nm (d-line).

TABLE 10 Aspheric Coefficients Surface # 1 2 3 4 6 7 k =  3.0030E−01−1.0000E+00 2.2771E+01 −2.9200E+01 −1.0000E+00 −2.7887E+01 A4 =−2.5446E−02 −1.2561E−01 −1.9626E−01  −8.6845E−02 −1.3500E−01 −9.1241E−02A6 = −2.9499E−02  1.5512E−01 3.0768E−01  1.8907E−01  1.9922E−01−1.0660E−01 A8 =  3.7232E−02 −5.4824E−02 −2.6844E−01  −1.8925E−01−8.8442E−02  4.5814E−02 A10 = −7.8839E−02 −1.3807E−01 2.0226E−02 1.6763E−01  3.3669E−02 −6.0048E−02 A12 =  7.0235E−02  2.1461E−011.6763E−01 −5.2260E−02  2.4023E−01 −7.3616E−02 A14 = −2.5091E−02−8.5981E−02 −7.7997E−02   9.1113E−02 −1.3830E−01  2.2832E−01 Surface # 89 10 11 12 13 k = −1.0000E+00 1.9261E+00 −6.0186E+00 −5.0000E+016.4452E+00 −9.0000E+01  A4 = −2.0584E−01 6.1546E−02 −2.1709E−01−2.5969E−01 4.1015E−02 5.8884E−02 A6 = −3.4022E−01 −1.3483E−01 −5.5720E−02  9.2062E−02 −1.1685E−02  −2.1723E−02  A8 =  2.6534E−011.1067E−01  6.4902E−02  2.4941E−03 2.3468E−03 2.0073E−03 A10 =−1.1288E+00 −4.3896E−02   2.2069E−02 −2.5139E−02 −3.1345E−04  6.8454E−04A12 =  7.6579E−01 −1.3494E−02  −8.9877E−02  1.6174E−02 5.7533E−05−1.5921E−04  A14 =  1.2798E−01 1.6888E−02  4.8084E−02 −3.3216E−03−1.0724E−05  4.4850E−06

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 4.69 (R11 − R12)/(R11 + R12) 0.76 Fno 2.65R12/|R11| −0.13 HFOV [deg.] 22.6 |R10 − R11|/f 19.02 Nmax 1.640 f/f4−0.66 CT3/T34 2.17 f/f5 −1.19 T23/T34 0.39 SD/TD 0.78 T45/T34 1.21 BL/TD0.13 (R5 + R6)/(R5 − R6) −1.60 TL [mm] 4.94 (R7 − R8)/(R7 + R8) −0.33

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 690. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 610, a second lens element 620, an aperture stop 600,a third lens element 630, a fourth lens element 640, a fifth lenselement 650, a sixth lens element 660, an IR-cut filter 670 and an imagesurface 680, wherein the photographing lens assembly has a total of sixlens elements (610-660) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 610, thesecond lens element 620, the third lens element 630, the fourth lenselement 640, the fifth lens element 650 and the sixth lens element 660that are adjacent to each other.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with negative refractive power has anobject-side surface 621 being convex in a paraxial region thereof and animage-side surface 622 being concave in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric.

The fourth lens element 640 with positive refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being concave in a paraxial region thereof andan image-side surface 652 being convex in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric.

The sixth lens element 660 with positive refractive power has anobject-side surface 661 being concave in a paraxial region thereof andan image-side surface 662 being convex in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. The image-side surface 662 of the sixth lens element 660 hasat least one inflection point.

The IR-cut filter 670 is made of glass and located between the sixthlens element 660 and the image surface 680, and will not affect thefocal length of the photographing lens assembly. The image sensor 690 isdisposed on or near the image surface 680 of the photographing lensassembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 4.37 mm, Fno = 2.70, HFOV = 24.1 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Lens 1 1.573 (ASP) 0.510 Plastic 1.544 55.94.02 2 4.961 (ASP) 0.030 3 Lens 2 5.127 (ASP) 0.230 Plastic 1.639 23.5−7.72 4 2.470 (ASP) 0.127 5 Ape. Stop Plano 0.041 6 Lens 3 1.941 (ASP)0.668 Plastic 1.544 55.9 4.15 7 12.086 (ASP) 0.539 8 Lens 4 −2.115 (ASP)0.700 Plastic 1.608 25.7 11.70 9 −1.834 (ASP) 0.368 10 Lens 5 −1.041(ASP) 0.561 Plastic 1.608 25.7 −3.42 11 −2.507 (ASP) 0.050 12 Lens 6−4.817 (ASP) 0.419 Plastic 1.544 55.9 19.95 13 −3.439 (ASP) 0.200 14IR-cut filter Plano 0.248 Glass 1.517 64.2 — 15 Plano 0.130 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 12 Aspheric Coefficients Surface # 1 2 3 4 6 7 k =  1.4634E−01−1.0000E+00 2.2832E+01 −1.6308E+01 −1.0000E+00 −3.6307E+01 A4 =−3.1610E−02 −1.3135E−01 −1.6035E−01  −1.3683E−02 −1.0388E−01 −8.1309E−02A6 = −3.9050E−02  1.4198E−01 3.1479E−01  2.2372E−01  1.7379E−01−5.3452E−02 A8 =  3.1698E−02 −5.6833E−02 −2.8550E−01  −2.4481E−01−4.0726E−02  5.7565E−02 A10 = −8.1256E−02 −1.4515E−01 1.5864E−03 1.9155E−01 −8.7690E−03 −7.5913E−03 A12 =  6.9967E−02  2.0165E−011.6306E−01 −8.6685E−02  1.6040E−01 −8.9785E−02 A14 = −2.2060E−02−8.0374E−02 −9.4883E−02   9.3997E−02 −3.9718E−02  2.3693E−01 Surface # 89 10 11 12 13 k = −1.0000E+00 1.1629E+00 −3.6484E+00 −6.8036E+00 5.2999E+00 −9.0000E+01 A4 = −2.0390E−01 1.0969E−01 −7.1177E−02−1.4754E−01 −4.3844E−02  8.2335E−02 A6 = −2.6803E−01 −1.4880E−01 −5.2949E−02  7.5384E−02  4.4463E−02 −6.6513E−02 A8 =  2.1736E−011.2421E−01  2.1935E−02 −1.2064E−03 −9.2652E−03  2.0938E−02 A10 =−8.8536E−01 −6.8616E−02  −7.8718E−04 −2.9452E−02 −3.9089E−04 −1.7204E−03A12 =  5.7120E−01 −2.0852E−02  −8.2123E−02  1.5257E−02  1.9819E−04−4.8085E−04 A14 =  1.2069E−01 4.4717E−02  5.5724E−02 −2.5558E−03−5.9321E−06  7.9250E−05

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 4.37 (R11 − R12)/(R11 + R12) 0.17 Fno 2.70R12/|R11| −0.71 HFOV [deg.] 24.1 |R10 − R11|/f 0.53 Nmax 1.639 f/f4 0.37CT3/T34 1.24 f/f5 −1.28 T23/T34 0.31 SD/TD 0.79 T45/T34 0.68 BL/TD 0.14(R5 + R6)/(R5 − R6) −1.38 TL [mm] 4.82 (R7 − R8)/(R7 + R8) 0.07

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 790. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 710, an aperture stop 700, a second lens element 720,a third lens element 730, a fourth lens element 740, a fifth lenselement 750, a sixth lens element 760, an IR-cut filter 770 and an imagesurface 780, wherein the photographing lens assembly has a total of sixlens elements (710-760) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 710, thesecond lens element 720, the third lens element 730, the fourth lenselement 740, the fifth lens element 750 and the sixth lens element 760that are adjacent to each other.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being convex in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric.

The second lens element 720 with negative refractive power has anobject-side surface 721 being concave in a paraxial region thereof andan image-side surface 722 being concave in a paraxial region thereof.The second lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with positive refractive power has anobject-side surface 731 being concave in a paraxial region thereof andan image-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being concave in a paraxial region thereof andan image-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being concave in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric. The object-side surface 751 of the fifth lens element 750 hasat least one inflection point. The image-side surface 752 of the fifthlens element 750 has at least one inflection point.

The sixth lens element 760 with positive refractive power has anobject-side surface 761 being concave in a paraxial region thereof andan image-side surface 762 being convex in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric. The image-side surface 762 of the sixth lens element 760 hasat least one inflection point.

The IR-cut filter 770 is made of glass and located between the sixthlens element 760 and the image surface 780, and will not affect thefocal length of the photographing lens assembly. The image sensor 790 isdisposed on or near the image surface 780 of the photographing lensassembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 5.43 mm, Fno = 2.60, HFOV = 27.5 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Lens 1 2.262 (ASP) 1.191 Plastic 1.535 56.33.80 2 −16.107 (ASP) −0.031  3 Ape. Stop Plano 0.301 4 Lens 2 −63.442(ASP) 0.269 Plastic 1.650 21.4 −6.73 5 4.703 (ASP) 0.663 6 Lens 3−66.007 (ASP) 1.150 Plastic 1.535 56.3 8.72 7 −4.381 (ASP) 0.490 8 Lens4 −0.804 (ASP) 0.260 Plastic 1.544 55.9 62.90 9 −0.875 (ASP) 0.258 10Lens 5 3.924 (ASP) 0.783 Plastic 1.650 21.4 −8.29 11 2.092 (ASP) 0.31212 Lens 6 −4.307 (ASP) 0.415 Plastic 1.544 55.9 21.58 13 −3.258 (ASP)0.300 14 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 15 Plano 0.181 16Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 1 2 4 5 6 7 k =  2.7470E−02−1.0000E+00 −5.0000E+01 −1.9396E+01 −1.0000E+00  5.6024E+00 A4 =−6.8108E−03 −2.8828E−02 −3.3169E−02  6.3344E−03 −4.9689E−02 −3.4335E−02A6 = −3.9368E−03  3.9041E−03  5.4677E−02  4.3019E−02 −1.0108E−02−8.7504E−03 A8 =  8.7470E−04 −8.7414E−05 −2.4714E−02 −1.1790E−02 2.4009E−03 −2.7721E−03 A10 = −2.8673E−03 −4.3409E−03  9.9343E−03−3.0491E−03 −4.4825E−03  9.8013E−04 A12 =  1.2838E−03  2.6285E−03−5.2551E−03  6.9705E−03 −9.9832E−04 −7.3293E−04 A14 = −3.1687E−04−3.0660E−04  3.1779E−03 −8.2555E−04  9.9886E−04  4.1223E−04 Surface # 89 10 11 12 13 k = −2.2081E+00 −2.5208E+00 1.9247E+00 −2.5208E+01−1.4997E+00  −9.0000E+01  A4 =  1.8335E−02  2.8191E−02 −7.3774E−02 −4.0467E−02 2.2475E−03 4.0939E−02 A6 = −5.5665E−02 −3.1295E−021.0722E−02 −1.1065E−03 3.3807E−03 −9.9468E−03  A8 =  2.3173E−02 1.1784E−02 −3.7324E−03   2.3545E−03 −1.1233E−03  9.2307E−04 A10 =−9.4115E−03 −1.3298E−03 5.2242E−04 −6.5147E−04 3.8984E−05 1.4718E−06 A12=  3.1226E−03 −3.0321E−04 1.8578E−05  7.5664E−05 1.8236E−05 −7.4206E−06 A14 = −3.2523E−04  6.1252E−05 −8.4158E−06  −3.0847E−06 −1.4701E−06 4.1419E−07

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 5.43 (R11 − R12)/(R11 + R12) 0.14 Fno 2.60R12/|R11| −0.76 HFOV [deg.] 27.5 |R10 − R11|/f 1.18 Nmax 1.650 f/f4 0.09CT3/T34 2.35 f/f5 −0.66 T23/T34 1.35 SD/TD 0.81 T45/T34 0.53 BL/TD 0.11(R5 + R6)/(R5 − R6) 1.14 TL [mm] 6.75 (R7 − R8)/(R7 + R8) −0.04

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 890. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 810, an aperture stop 800, a second lens element 820,a third lens element 830, a fourth lens element 840, a fifth lenselement 850, a sixth lens element 860, an IR-cut filter 870 and an imagesurface 880, wherein the photographing lens assembly has a total of sixlens elements (810-860) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 810, thesecond lens element 820, the third lens element 830, the fourth lenselement 840, the fifth lens element 850 and the sixth lens element 860that are adjacent to each other.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being convex in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 820 with negative refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being concave in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with positive refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being convex in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being convex in a paraxial region thereof and animage-side surface 852 being concave in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric. The object-side surface 851 of the fifth lens element 850 hasat least one inflection point. The image-side surface 852 of the fifthlens element 850 has at least one inflection point.

The sixth lens element 860 with positive refractive power has anobject-side surface 861 being concave in a paraxial region thereof andan image-side surface 862 being convex in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric. The object-side surface 861 of the sixth lens element 860 hasat least one inflection point. The image-side surface 862 of the sixthlens element 860 has at least one inflection point.

The IR-cut filter 870 is made of glass and located between the sixthlens element 860 and the image surface 880, and will not affect thefocal length of the photographing lens assembly. The image sensor 890 isdisposed on or near the image surface 880 of the photographing lensassembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 4.66 mm, Fno = 2.05, HFOV = 25.2 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Lens 1 1.949 (ASP) 0.799 Plastic 1.535 56.33.37 2 −20.772 (ASP) −0.039  3 Ape. Stop Plano 0.298 4 Lens 2 4.556(ASP) 0.369 Plastic 1.639 23.5 −4.90 5 1.798 (ASP) 0.434 6 Lens 3 18.553(ASP) 0.606 Plastic 1.535 56.3 6.29 7 −4.059 (ASP) 0.620 8 Lens 4 −0.997(ASP) 0.330 Plastic 1.650 21.4 48.67 9 −1.092 (ASP) 0.085 10 Lens 53.960 (ASP) 0.800 Plastic 1.650 21.4 −8.75 11 2.148 (ASP) 0.185 12 Lens6 −3.629 (ASP) 0.380 Plastic 1.544 55.9 58.52 13 −3.378 (ASP) 0.300 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.185 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 16 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = −3.0968E−02−1.0000E+00 −3.0063E+01 −5.2376E+00 −1.0000E+00 −6.9896E+00 A4 =−4.6350E−03 −1.1412E−02 −5.3353E−02 −3.5596E−03 −4.0653E−02 −1.7857E−02A6 = −1.0394E−03  1.2379E−02  6.8438E−02  4.9993E−02  2.8047E−04−4.3382E−03 A8 = −1.9233E−03 −1.1489E−02 −5.3124E−02 −1.2824E−02 8.7258E−03  6.7166E−03 A10 = −4.4167E−03 −6.1174E−03  2.3581E−02−1.9520E−02 −1.1017E−04 −3.7016E−03 A12 =  4.3445E−03  7.8028E−03−2.2589E−03  3.0118E−02 −1.2327E−02 −2.1810E−03 A14 = −2.1142E−03−2.8363E−03 −9.3142E−04 −7.6784E−03  9.2030E−03  1.1466E−03 Surface # 89 10 11 12 13 k = −3.9639E+00 −4.3395E+00 −1.0543E+01 −3.4565E+01 −2.1865E+01 −9.0000E+01  A4 =  4.2721E−02  3.8342E−02 −9.1584E−02−7.7817E−02  −1.0305E−02 6.0636E−02 A6 = −4.6185E−02 −3.7278E−02 1.8251E−02 8.1848E−03  7.5340E−03 −1.9725E−02  A8 =  1.6987E−02 1.0144E−02 −1.0416E−02 8.0418E−04 −8.5049E−04 2.6329E−03 A10 =−7.9894E−03 −9.4406E−04  9.0438E−04 −4.7424E−04  −2.3109E−06 1.4497E−06A12 =  3.3719E−03  2.1342E−04  4.7510E−04 3.9577E−05  8.8908E−06−3.5986E−05  A14 = −1.2370E−03 −5.1595E−05 −7.9630E−05 5.8836E−07−4.7175E−07 2.9191E−06

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 4.66 (R11 − R12)/(R11 + R12) 0.04 Fno 2.05R12/|R11| −0.93 HFOV [deg.] 25.2 |R10 − R11|/f 1.24 Nmax 1.650 f/f4 0.10CT3/T34 0.98 f/f5 −0.53 T23/T34 0.70 SD/TD 0.84 T45/T34 0.14 BL/TD 0.16(R5 + R6)/(R5 − R6) 0.64 TL [mm] 5.65 (R7 − R8)/(R7 + R8) −0.05

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 990. The photographing lensassembly includes, in order from an object side to an image side, anaperture stop 900, a first lens element 910, a second lens element 920,a third lens element 930, a fourth lens element 940, a fifth lenselement 950, a sixth lens element 960, an IR-cut filter 970 and an imagesurface 980, wherein the photographing lens assembly has a total of sixlens elements (910-960) with refractive power. There is an air gap in aparaxial region between every two of the first lens element 910, thesecond lens element 920, the third lens element 930, the fourth lenselement 940, the fifth lens element 950 and the sixth lens element 960that are adjacent to each other.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being convex in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric.

The second lens element 920 with negative refractive power has anobject-side surface 921 being convex in a paraxial region thereof and animage-side surface 922 being concave in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric.

The third lens element 930 with positive refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being convex in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being convex in a paraxial region thereof and animage-side surface 952 being concave in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric. The object-side surface 951 of the fifth lens element 950 hasat least one inflection point. The image-side surface 952 of the fifthlens element 950 has at least one inflection point.

The sixth lens element 960 with positive refractive power has anobject-side surface 961 being concave in a paraxial region thereof andan image-side surface 962 being convex in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric. The object-side surface 961 of the sixth lens element 960 hasat least one inflection point. The image-side surface 962 of the sixthlens element 960 has at least one inflection point.

The IR-cut filter 970 is made of glass and located between the sixthlens element 960 and the image surface 980, and will not affect thefocal length of the photographing lens assembly. The image sensor 990 isdisposed on or near the image surface 980 of the photographing lensassembly.

The detailed optical data of the 8th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 4.76 mm, Fno = 2.40, HFOV = 24.7 deg.Surface # Curvature Radius Thickness Material Index Abbe # Focal Length0 Object Plano Infinity 1 Ape. Stop Plano −0.200  2 Lens 1 1.880 (ASP)0.797 Plastic 1.535 55.7 3.44 3 −78.921 (ASP) 0.261 4 Lens 2 4.467 (ASP)0.257 Plastic 1.650 21.4 −5.21 5 1.883 (ASP) 0.383 6 Lens 3 10.363 (ASP)0.910 Plastic 1.535 56.3 6.46 7 −5.015 (ASP) 0.677 8 Lens 4 −0.654 (ASP)0.330 Plastic 1.544 55.9 282.82 9 −0.767 (ASP) 0.070 10 Lens 5 2.576(ASP) 0.683 Plastic 1.650 21.4 −5.49 11 1.340 (ASP) 0.189 12 Lens 6−23.341 (ASP) 0.480 Plastic 1.544 55.9 6.22 13 −2.975 (ASP) 0.300 14IR-cut filter Plano 0.372 Glass 1.517 64.2 — 15 Plano 0.182 16 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −1.2614E−01−1.0000E+00 −4.4726E+01 −7.2847E+00 −1.0000E+00 1.0356E+01 A4 =−5.9892E−03 −2.5474E−02 −4.7831E−02  6.7467E−03 −6.5162E−02 −4.7689E−02 A6 = −5.5965E−03  1.1942E−03  7.0042E−02  5.8405E−02 −2.9924E−03−3.5293E−03  A8 = −3.6381E−03 −1.4582E−02 −5.2863E−02 −1.4313E−02 4.8676E−03 4.2016E−03 A10 = −4.5734E−03 −5.5662E−03  2.5687E−02−1.4727E−02  1.4570E−03 2.3787E−04 A12 =  2.8097E−03  9.0434E−03−2.3412E−04  3.9184E−02 −7.5007E−03 8.4033E−04 A14 = −2.5427E−03−3.6484E−03 −2.2074E−03 −9.5059E−03  1.3769E−02 5.6982E−04 Surface # 8 910 11 12 13 k = −2.2098E+00 −2.9926E+00 −7.1941E+00 −1.6609E+013.8813E+01 −7.0430E+01 A4 =  2.8435E−03  5.7673E−02 −5.7769E−02−3.5540E−02 1.3175E−02  6.1675E−02 A6 = −4.3397E−02 −3.1872E−02 1.7666E−02 −1.9077E−03 2.6087E−03 −1.6175E−02 A8 =  2.2611E−02 1.0196E−02 −9.4790E−03  1.2637E−03 −9.3044E−04   2.0429E−03 A10 =−6.9699E−03 −1.7188E−03  1.1639E−03 −3.6488E−04 2.4588E−05 −2.2774E−05A12 =  2.5062E−03 −1.2574E−04  3.6082E−04  6.2574E−05 1.2678E−05−3.2308E−05 A14 = −1.1662E−03  8.9558E−06 −7.4685E−05 −4.1047E−06−6.8990E−07   3.2216E−06

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 4.76 (R11 − R12)/(R11 + R12) 0.77 Fno 2.40R12/|R11| −0.13 HFOV [deg.] 24.7 |R10 − R11|/f 5.18 Nmax 1.650 f/f4 0.02CT3/T34 1.34 f/f5 −0.87 T23/T34 0.57 SD/TD 0.96 T45/T34 0.10 BL/TD 0.17(R5 + R6)/(R5 − R6) 0.35 TL [mm] 5.89 (R7 − R8)/(R7 + R8) −0.08

The foregoing image capturing unit is able to be installed in, but notlimited to, an electronic device, including smart phones, tabletpersonal computers and wearable devices. According to the presentdisclosure, the first lens element has positive refractive power so thatit is favorable for keeping the photographing lens assembly in a compactsize thereof. The second lens element has positive refractive power sothat it is favorable for correcting the chromatic aberration of thephotographing lens assembly. The sixth lens element has positiverefractive power so that it is favorable for balancing the refractivepower distribution of the photographing lens assembly. The sixth lenselement has the object-side surface being concave in a paraxial regionthereof and the image-side surface being convex in a paraxial regionthereof so that it is favorable for correcting the aberration at theperipheral region of the image. When specific conditions are satisfied,the axial distances between the third lens element and adjacent lenselements are properly distributed so that it is favorable for improvingthe image quality and providing the photographing lens assembly withsufficient amount of space; thereby, it is favorable for assembling thephotographing lens assembly so as to increase the manufacturing yieldrate. Furthermore, it is favorable for reducing the total track lengthof the photographing lens assembly and providing sufficient relativeillumination.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-18 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A photographing lens assembly comprising, inorder from an object side to an image side: a first lens element withpositive refractive power having an object-side surface being convex; asecond lens element having negative refractive power; a third lenselement having an image-side surface being concave; a fourth lenselement having an object-side surface and an image-side surface beingboth aspheric; a fifth lens element having an object-side surface and animage-side surface being both aspheric, wherein at least one of theobject-side surface and the image-side surface of the fifth lens elementhas at least one inflection point; and a sixth lens element withpositive refractive power having an object-side surface and animage-side surface being both aspheric; wherein the photographing lensassembly has a total of six lens elements, an axial distance between theimage-side surface of the sixth lens element and an image surface is BL,an axial distance between the object-side surface of the first lenselement and the image-side surface of the sixth lens element is TD, anaxial distance between the second lens element and the third lenselement is T23, an axial distance between the third lens element and thefourth lens element is T34, and the following conditions are satisfied:0.1<BL/TD<0.25; and0.31≤T23/T34<1.5.
 2. The photographing lens assembly of claim 1, whereinthe fifth lens element has negative refractive power.
 3. Thephotographing lens assembly of claim 1, wherein the image-side surfaceof the fifth lens element is concave.
 4. The photographing lens assemblyof claim 1, wherein a focal length of the photographing lens assembly isf, a curvature radius of the image-side surface of the fifth lenselement is R10, a curvature radius of the object-side surface of thesixth lens element is R11, and the following condition is satisfied:0.25<|R10−R11|/f.
 5. The photographing lens assembly of claim 1, whereina curvature radius of the object-side surface of the fourth lens elementis R7, a curvature radius of the image-side surface of the fourth lenselement is R8, and the following condition is satisfied:−0.5<(R7−R8)/(R7+R8)<0.5.
 6. The photographing lens assembly of claim 1,wherein a focal length of the photographing lens assembly is f, a focallength of the fourth lens element is f4, a maximum refractive indexamong the lens elements of the photographing lens assembly is Nmax, andthe following conditions are satisfied:−1.0<f/f4<0.5; and1.50<Nmax<1.70.
 7. The photographing lens assembly of claim 1, whereinthere is an air gap in a paraxial region between every two of the firstlens element, the second lens element, the third lens element, thefourth lens element, the fifth lens element and the sixth lens elementthat are adjacent to each other; an axial distance between theobject-side surface of the first lens element and the image surface isTL, and the following condition is satisfied:TL<8.0 millimeters (mm).
 8. The photographing lens assembly of claim 1,wherein a focal length of the first lens element is f1, a focal lengthof the second lens element is f2, a focal length of the third lenselement is f3, a focal length of the fourth lens element is f4, a focallength of the fifth lens element is f5, a focal length of the sixth lenselement is f6, a focal length of the i-th lens element is fi, and thefollowing condition is satisfied:|f1|<|fi|, wherein i=2, 3, 4, 5,
 6. 9. The photographing lens assemblyof claim 1, further comprising an aperture stop, wherein there is nolens element between the aperture stop and the first lens element.
 10. Aphotographing lens assembly comprising, in order from an object side toan image side: a first lens element with positive refractive powerhaving an object-side surface being convex; a second lens element withnegative refractive power having an object-side surface being convex andan image-side surface being concave; a third lens element; a fourth lenselement having an object-side surface and an image-side surface beingboth aspheric; a fifth lens element having an object-side surface and animage-side surface being both aspheric, wherein at least one of theobject-side surface and the image-side surface of the fifth lens elementhas at least one inflection point; and a sixth lens element withpositive refractive power having an image-side surface being convex,wherein an object-side surface and the image-side surface of the sixthlens element are both aspheric; wherein the photographing lens assemblyhas a total of six lens elements, and a central thickness of the sixthlens element is larger than an axial distance between the fifth lenselement and the sixth lens element; wherein an axial distance betweenthe image-side surface of the sixth lens element and an image surface isBL, an axial distance between the object-side surface of the first lenselement and the image-side surface of the sixth lens element is TD, anaxial distance between the second lens element and the third lenselement is T23, an axial distance between the third lens element and thefourth lens element is T34, and the following conditions are satisfied:0.1<BL/TD<0.25; and0<T23/T34<2.5.
 11. The photographing lens assembly of claim 10, whereina focal length of the photographing lens assembly is f, a focal lengthof the fourth lens element is f4, and the following condition issatisfied:−1.0<f/f4<0.5.
 12. The photographing lens assembly of claim 10, furthercomprising an aperture stop, wherein the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element and the sixth lens element are all made of plasticmaterial, and there is no lens element between the aperture stop and thefirst lens element.
 13. The photographing lens assembly of claim 10,wherein a focal length of the first lens element is f1, a focal lengthof the second lens element is f2, a focal length of the third lenselement is f3, a focal length of the fourth lens element is f4, a focallength of the fifth lens element is f5, a focal length of the sixth lenselement is f6, a focal length of the i-th lens element is fi, a focallength of the photographing lens assembly is f, a curvature radius ofthe image-side surface of the fifth lens element is R10, a curvatureradius of the object-side surface of the sixth lens element is R11, andthe following conditions are satisfied:|f1|<|fi|, wherein i=2, 3, 4, 5, 6; and0.25<|R10−R11|/f.
 14. The photographing lens assembly of claim 10,wherein a central thickness of the third lens element is CT3, the axialdistance between the third lens element and the fourth lens element isT34, and the following condition is satisfied:0.5<CT3/T34<1.9.
 15. The photographing lens assembly of claim 10,wherein the image-side surface of the fifth lens element is concave. 16.The photographing lens assembly of claim 10, wherein a central thicknessof the third lens element is smaller than a central thickness of thefifth lens element.
 17. A photographing lens assembly comprising, inorder from an object side to an image side: a first lens element havingpositive refractive power; a second lens element having negativerefractive power; a third lens element having an image-side surfacebeing concave; a fourth lens element having an object-side surface andan image-side surface being both aspheric; a fifth lens element havingan object-side surface and an image-side surface being both aspheric;and a sixth lens element with positive refractive power having anobject-side surface and an image-side surface being both aspheric;wherein the photographing lens assembly has a total of six lenselements, at least one of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement and the sixth lens element has at least one inflection point,and an axial distance between the fourth lens element and the fifth lenselement is larger than an axial distance between the fifth lens elementand the sixth lens element; wherein an axial distance between theimage-side surface of the sixth lens element and an image surface is BL,an axial distance between an object-side surface of the first lenselement and the image-side surface of the sixth lens element is TD, afocal length of the photographing lens assembly is f, a focal length ofthe fourth lens element is f4, and the following conditions aresatisfied:0.1<BL/TD<0.25; and−1.0<f/f4<0.5.
 18. The photographing lens assembly of claim 17, whereinthe fourth lens element has negative refractive power.
 19. Thephotographing lens assembly of claim 17, wherein an axial distancebetween the second lens element and the third lens element is T23, anaxial distance between the third lens element and the fourth lenselement is T34, and the following condition is satisfied:0<T23/T34<1.5.
 20. The photographing lens assembly of claim 17, whereinthe focal length of the photographing lens assembly is f, a curvatureradius of the image-side surface of the fifth lens element is R10, acurvature radius of the object-side surface of the sixth lens element isR11, and the following condition is satisfied:0.25<|R10−R11|/f.
 21. The photographing lens assembly of claim 17,further comprising an aperture stop, wherein the first lens element, thesecond lens element, the third lens element, the fourth lens element,the fifth lens element and the sixth lens element are all made ofplastic material, and there is no lens element between the aperture stopand the first lens element.
 22. The photographing lens assembly of claim17, wherein a focal length of the third lens element has the same signas the focal length of the fourth lens element; a maximum refractiveindex among the lens elements of the photographing lens assembly isNmax, and the following condition is satisfied:1.50<Nmax<1.70.
 23. The photographing lens assembly of claim 17, whereina central thickness of the first lens element is larger than a centralthickness of the sixth lens element.
 24. The photographing lens assemblyof claim 17, wherein an axial distance between the third lens elementand the fourth lens element is smaller than the axial distance betweenthe fourth lens element and the fifth lens element.
 25. A photographinglens assembly comprising, in order from an object side to an image side:a first lens element with positive refractive power having anobject-side surface being convex; a second lens element with negativerefractive power having an image-side surface being concave; a thirdlens element; a fourth lens element having an object-side surface and animage-side surface being both aspheric; a fifth lens element having animage-side surface being concave, wherein an object-side surface and theimage-side surface of the fifth lens element are both aspheric; and asixth lens element with positive refractive power having an object-sidesurface and an image-side surface being both aspheric; wherein thephotographing lens assembly has a total of six lens elements, at leastone of the first lens element, the second lens element, the third lenselement, the fourth lens element, the fifth lens element and the sixthlens element has at least one inflection point, and an axial distancebetween the third lens element and the fourth lens element is smallerthan an axial distance between the fourth lens element and the fifthlens element; wherein an axial distance between the image-side surfaceof the sixth lens element and an image surface is BL, an axial distancebetween the object-side surface of the first lens element and theimage-side surface of the sixth lens element is TD, an axial distancebetween the second lens element and the third lens element is T23, theaxial distance between the third lens element and the fourth lenselement is T34, and the following conditions are satisfied:0.1<BL/TD<0.25; and0<T23/T34<2.5.
 26. The photographing lens assembly of claim 25, whereinthe fourth lens element has negative refractive power.
 27. Thephotographing lens assembly of claim 25, wherein the third lens elementhas an object-side surface being convex, and at least one of theobject-side surface and the image-side surface of the fifth lens elementhas at least one inflection point.
 28. The photographing lens assemblyof claim 25, wherein a curvature radius of the object-side surface ofthe fourth lens element is R7, a curvature radius of the image-sidesurface of the fourth lens element is R8, and the following condition issatisfied:−0.5<(R7−R8)/(R7+R8)<0.5.
 29. The photographing lens assembly of claim25, further comprising an aperture stop, wherein an axial distancebetween the object-side surface of the first lens element and the imagesurface is TL, an axial distance between the aperture stop and theimage-side surface of the sixth lens element is SD, the axial distancebetween the object-side surface of the first lens element and theimage-side surface of the sixth lens element is TD, and the followingconditions are satisfied:TL<8.0 mm; and0.75<SD/TD<1.2.
 30. The photographing lens assembly of claim 25, whereina focal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, a focal length of the i-th lens element is fi, and the followingcondition is satisfied:|f1|<|fi|, wherein i=2, 3, 4, 5,
 6. 31. The photographing lens assemblyof claim 25, wherein the axial distance between the second lens elementand the third lens element is T23, the axial distance between the thirdlens element and the fourth lens element is T34, and the followingcondition is satisfied:0<T23/T34<1.5.
 32. The photographing lens assembly of claim 25, whereinthe object-side surface of the first lens element has the smallestabsolute value of curvature radius among all object-side surfaces andimage-side surfaces of the lens elements.
 33. The photographing lensassembly of claim 25, wherein an absolute value of a curvature radius ofthe image-side surface of the second lens element is smaller than anabsolute value of a curvature radius of the image-side surface of thesixth lens element.
 34. An image capturing unit, comprising: thephotographing lens assembly of claim 25; and an image sensor, whereinthe image sensor is disposed on the image surface of the photographinglens assembly.
 35. An electronic device, comprising: the image capturingunit of claim 34.